"Louis van Gaal was the manager of a Premier League opponent, and he's just been sacked, but I can't say a bad word about him," he told Belgian newspaper Derniere Heure.
"He taught me a lot at AZ - his trainings, his style of play, his way of motivating us, he was a great.
"I guess he hasn't changed. Nevertheless, he suffered a difficult season at Manchester United.
"For me, that's baffling, but that's football and if I'm the footballer I am today, it's partly thanks to Van Gaal."
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